Piston for internal combustion motors



Feb. 22, 1938. E. c. LONG PISTON FOR INTERNAL COMBUSTION MOTORS Filed June 10, 1935 m .a 0 SW 5% if; M/%

ATTORNEY.

Patented Feb. .22, 19 8 Piston FOB.

INTERNAL COMBUSTION Morons I V Elmer 0. Long, Grosse Pointe Park. Mich. Application June 10. 1935, Serial No. 25.751

1': Claims.

1 This invention relates to pistons for internal combustion motors and particularly to pistons made from an aluminum alloy metal, and in which the bearing walls of the skirt are discon- I nected from the side wall of the head andare resiliently and flexibly connected to the pin bosses.

The invention also is a furthering oi the improvements in pistons, disclosed in U. S. Letters Patent No. 2,017,630, granted to me October 15, 1935, for Pistons for internal combustion motors,

the instant application having distinctly difiercut and specific improvements, not disclosedin said copending application. 2

The main object of the invention is to provide 1 a piston whereby thermal expansion of the head on a diameter across the pin bosses will be made coactable with the skirt sections through the supports for the sections which are extended from the pin bosses for tending to draw the skirt sections inwardly and thus preventing them from seizing the cylinder wall of a cylinder.

Another objectof the invention is the provision of means which form part of the piston for adjusting the skirt sections to a precise degree Figure 3 is 'a vertical section taken approximatcly on the line IIII]I of Fig. 2. Figure 4 is an open end view of the piston shown in Fig. 1.

Figure 5 is a horizontal section taken approximately on the line V--V of Fig. 2. Y 1

Figure 6 is a horizontal section showing a modified form of the invention, and as taken on the line VI.VI of Fig. 2.

Referring to Figs. 1to 5 inclusive of the drawing. this improved piston comprises a head I having a side wall 2 with packing ring recesses 5 3 on its outer periphery and depended from the side wall in'diametrically opposite disposition are legs 4 and integral with each leg is a pin boss- 5. Joining the head I the side wall 2 and the legs 4 is a web 8.

o Paralleling each leg 4 inwardly thereof and spaced therefrom is a transverse wall I, said walls at their extending ends on one side of the pin bosses joining a skirt section 8 which forms the power thrust side A of thepiston, and the exprising two slipper sections 9.

The skirt section 8 (power thrust side A) and the slipper sections 9 (compression thrust side 5 B) comprise the skirt of this improved piston, said sections 8 and 9 being separated from the sidewall 2 of the head I by transverse gaps I8, and the slipper sections 9 being separatd' from one another by the longitudinally extending slot II which extends from top to bottom of the slip- .per sections. Y

The walls I where they each connect with respective pin bosses 5 are partially severed from the pin bosses by slots I2 (Figs.'4 and 5), thus forming a partially separated pin boss part I3 on the inner end of each pin boss wherein the part l3 of each pin boss 5 is joined with the pin boss proper on its upper and lower sides only, by connectors as shown at It in Figs. 4, and 5.

This partial severing of the walls I from the pin bosses 5 will provide for a greater flexibility of the walls with the pin bosses during operation of the piston in the cylinder of a motor, and for further assisting the flexible connection of the 25 walls with the pin bosses, the pin bores I5 of the bosses are enlarged as indicated at I6 in each pin boss part I3. This is for the purpose of preventing bindin g, if any, 01' the parts I3 although it may hereinafter be found not to be necessary to enlargethe pin bore of the parts I3.

The walls 7 intermediate the pin bosses and the slipper sections 9 are provided with a tie bolt H which passes through said walls, said bolt preferably being of a metal of material having a less co-eflicient of expansion than the material of the piston. a 3

The tie bolt I! is provided. with an enlarged threaded portion I8 adjacentits head I8, said enlarged portion being located in' the unthreaded opening 20' which is iormed in one of the walls I and. cooperable with the threads of said enlarged portion I8 is an adjusting nut 2 I. The other end of the tie bolt I1 is threaded as shown at 2 2, said threaded end being engaged in the threaded opening 23 of the other wall I; and cooperable with the threads 22 of the extending end of the tie bolt I1 is a locknut 24. v

In the operation of this improved piston when mounted in the cylinder 01 an internal combustion motor, as the head I of the piston will re- 'ceive the greatest heat from the burning fuel in the cylinder, expansion of the head of the piston on a diameter across the pin bosses will carry the approximate same degree to which the head I being carried outwardly by the outward moving forces of the pin bosses and in fact, the-slipper sections will be moved inwardly towards each other by reason of the tie bolt l'l serving as a toggle because of the inner ends of the walls being connected to respective pin boss parts It which will be carried outwardly with the pin bosses 5.

Owing to themanner in which the parts l3 are connected to respective pin bosses 5 by axially I alining connectors It, said parts and the walls I extending therefromwill fulcrum on the connectors as the pin bosses are moved outwardly by expansion by reason of the tie bolt II preventing the walls 1 from being carried outwardly by the outward travel of the pin bosses, and thus causing the slipper sections 9 to move inwardly thereby withholding the slipper sections 9 from' too tightly engaging the cylinder wall and thus preventingscoring of either the piston skirt or the cylinder. I

The tie bolt II can also be used for adjusting the slipper sections 9 for providing a working iit of the skirt in the cylinder.

In addition to the walls I and the tie bolt ll operating to draw the slipper sections 9 towards each other, said walls I which connect the skirt section 8 will also be flexed by the outward movement of the pin bosses 5, thus tending to .and in the manner as shown in Fig. 6 wherein Y ea'ch skirt thrust side comprises a pair of slipper sections 25 and a tie bolt 26 is mounted in the walls 21 on each side ofthe pin bosses 28 so that a uniformity of action will be carried out in respect to drawing in each pair of slipper sections, as the pin bosses 28 are moved outwardly by expansion of the head.

Having thus described my invention so that those skilled in the art will be able to practice the same, what I desire to secure by Letters Patent is definedin what is claimed, it being understood that various changes in the pistons shown and described above in detail and not amounting to invention may be made without departing from the spirit and scope of my invention.

What I claim is:

1.-A piston comprising ahead, a skirt, pin bosses, and .walls joining said skirt and bosses, the joining of said walls with said bosses bein in the diametral planes only of the inner ends of said bosses axially of the piston.

2. A piston comprising a head, a skirt, pin bosses, walls joining said.skirt' and bosses, the joining of said walls with said bosses being in the diametral planes only of the inner ends of the diametral planes only of the inner ends of said axially of the piston,'said skirt havingapairofslippersectionsformingoneofits thrust sides, and a tying member connecting said walls adjacent said slipper sections.

4. A piston comprising a head, a skirt, pin bosses, walls joining said skirt and bosses, the joining of said walls with said bosses being in the diametral planes only of the inner ends of said bosses axially of the piston, said skirt having a pair of slipper sections forming one of its thrust sides, and a tying member of material different than the piston connecting said wall's'adjacent said slipper sections.

5. A piston comprising a head, a skirt, pin bosses, walls joining said skirt and bosses, the

joining of saidwalls with said bosses being in the diametral planes only of the inner ends of said bosses axially of the piston, said skirt having a pair of slipper sections which are separated from the head and forming one of its thrust sides,

. and a tying member of material different than the piston connecting said walls adjacent said slipper sections.

6. A piston comprising a head, a skirt, pin bosses, walls joining said skirt and bosses, the joining of said walls with said bosses being in the diametral planes only of the inner ends of said bosses axially of the piston, said having a pair of slipper sections which are separated from the head and forming one of its thrust sides, and a tying member connecting said walls adjacent said slipper sections.

7. A piston comprising a head, a skirt, pin bosses, and a pair of walls connected at their ends to opposing sides of the skirt and having intermediate connection with a respective pin boss in the diametral planes only of the inner ends of said bosses axially of the piston.

8. A piston comprising a head, a skirt pin bosses, walls joining said skirt and the inner ends of said bosses in the diametral planes only axially of the piston, said skirt being slotted onone side between the joining of said walls therewith, and a transverse tying member joining said walls adjacent the slotted side of the skirt.

9,-A piston comprising a head, a skirt, pin bosses, walls joining said skirt and the inner ends of said bosses above and below the pin bores thereof in their vertical diametral planes only, said skirt having a pair of slipper sections which are separated from the head and forming one of its thrust sides, and a tying member connecting said walls adjacent said slipper sections.

10. A piston comprising a head, a-skirt separated from the head, pin bosses depending from the head, each pin boss having an alining pin boss part joined thereto in the diametral plane only thereof axially of the piston, walls joining said skirt and respective pin boss parts, said skirt having a pair of, slipper sections forming one of its thrust sides, and a tying member of material different than the piston connecting said walls adjacent said slipper sections.

11. A piston comprising a head, a skirt, pin bosses, each pin boss having an inner disposed pin boss part which is connected thereto in the diametral plane only of the inner end thereof' axially of the piston, and walls joiningsaid skirt and the respective pin boss parts of said bosses.

12. A piston comprising a head, a skirt, pin bosses, eachpinboshavinganaliningpinbcss part joined thereto in the diametral plane only thereof axially of the piston, and walls joining said skirt and respective pin boss parts.

13. A piston comprising a head, a skirt having opposing thrust sides, pin bosses. each pin hos havinganaliningpinbosspartjcinedthereto in the diametral plane only thereof axially of the piston, said skirt being longitudinally slotted ture connected to the head and comprising diametrically opposite slipper sections, pin bosses between the slipper sections each having an alining pin boss part joined thereto inthe diametral plane only thereof axially of the piston, and walls joining said slipper sections and respective pin boss parts.

15. A piston comprising a head, a skirt having opposing slotted thrust sides and pin bosses, each pin boss having an alining pin boss part joined thereto in the diametral plane only thereof axially of the piston, and walls joining said skirt and respective pin boss parts.

16; A piston comprising a head, a skirt having opposing slotte'd thrust sides and pin bosses, each pin boss having an alining pin boss part joined thereto in the diametral plane only thereof axially of the piston, walls joining said skirt and-respective pin boss parts, and a tying member connecting said walls disposed on each side of the v pin bosses.

17. A piston having a head, a cross-head structure connected to the head and comprising diametrically opposite slipper sections, pin bosses between the slipper sections each having an alining pin boss'part joined thereto in the diametral plane only thereof axially of the pis ton, walls joining said slipper sections and respective pin boss parts, and a tying member connecting said walls disposed on each side of the pin bosses.

' ELMER C. LONG. 

